A big problem with database triggers is that the application does not know that they exist, therefore does not know whether they have run or not.
应用程序是感知不到触发器的存在的，因此也不知道他们运行了还是没有，这是一个大问题。
Other disks and volume groups also exist for application data but are not depicted for simplicity.
为应用程序数据所用的其他的磁盘和卷组也存在，但为了简便起见，没有对之进行描述。
This application does not actually exist-that is, it exists only in theory.
此应用程序并不实际存在—就是说，只存在于理论中。
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